Attach the suction cup (included) to the Mounting Bracket. Slide bracket over heater to position indicated.

Place Accu-Therm Heater in aquarium by firmly pressing suction ends against wall surface. Choose an algae-free location with adequate circulation. This ensures even heat distribution and optimum operation. No part of the heater housing should contact aquarium gravel, rocks or decorations.

Wait at least 15 minutes before plugging in your heater. The On/Off indicator light will confirm that the power is on. Note: Before plugging in heater, create a drip loop to prevent water from reaching electrical receptacle.

Select the desired temperature. Turn the thermostat until the point on the side of the dial is at the correct setting. Most tropical fish like 76°-81° water.

A sharp drop in water temperature is extremely stressful to fish and can compromise their immune system. Improperly sized heaters may not be able to maintain their set temperature and cause aquarium temperature to fluctuate several degrees per day.

Temperature can be the single most important component in the life of your fish. Fish, in the wild and in our aquariums, are very sensitive to changes in temperature. Learn the affects of water temperature on fish health.

Don't take the quality of your tap water for granted. If you draw your water from a well, nature may not be providing you the perfect balance. If you are using tap water from your municipal department, it likely includes minerals and additives.

Algae are prolific and opportunistic organisms that take advantage of aquarium systems that are out of balance. Water quality issues create ideal conditions for algae. This article explains how proper water quality helps control algae.

Please note: Return of electrical equipment to Drs. Foster & Smith for exchange or refund is limited to 60 days from the date of purchase. Beyond 60 days, please contact the manufacturer for repair or replacement as covered by the manufacturer's warranty.

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Cobalt Aquatics Accu-Therm Heater 25W (mfg# 31010)
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good product
I have had the heater running for about 2 weeks now and it has worked great. It took it less than an hour to get my 20gal holding tank up to tempreture. Over all I am happy with it, and for the price you can't beat it.
March 6, 2015

neat looking therm heater
Had this heater for over a month and going strong. Very accurate heater. Did not have to adjust the temperature setting on the unite in spite of the changing room temperature. Its a bit pricey but my turtles are happy. No complaints here.
February 14, 2015

No more temperature worries
Fully immersable, easy to set, and accurately holds that temperature.Oh yeah, blends into the the background nicely too and my freshwater fish actually seem to be more active in the even temperature.
February 11, 2015

Accurate, Dependable
This was one of the few places that carries Cobalt heaters. It stays at the temp it's set. Have had no problems with it. High quality product.
April 11, 2014